Application that crashed: kmail
Version of the application: 1.11.90
KDE Version: 4.2.90 (KDE 4.2.90 (KDE 4.3 Beta2)) "release 138"
Qt Version: 4.5.1
Operating System: Linux 2.6.27.23-0.1-default i686

What I was doing when the application crashed:
KMail crashed when I brought its window up (it had been running before, for quite some time). The only notable thing I can think of is that the computer had just woken up from suspended mode.

 -- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[KCrash Handler]
#6  KIO::Slave::deref (this=0x8e14a40) at /usr/src/debug/kdelibs-4.2.90/kio/kio/slave.cpp:242
#7  0xb6dc0bbc in KIO::Slave::gotInput (this=0x8e14a40) at /usr/src/debug/kdelibs-4.2.90/kio/kio/slave.cpp:335
#8  0xb6dc3043 in KIO::Slave::qt_metacall (this=0x8e14a40, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbfbc8108) at /usr/src/debug/kdelibs-4.2.90/build/kio/slave.moc:76
#9  0xb6a9bdc8 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#10 0xb6a9d552 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#11 0xb6ccc087 in KIO::Connection::readyRead (this=0x8db8ee8) at /usr/src/debug/kdelibs-4.2.90/build/kio/connection.moc:86
#12 0xb6ccd9f3 in KIO::ConnectionPrivate::dequeue (this=0x9443760) at /usr/src/debug/kdelibs-4.2.90/kio/kio/connection.cpp:82
#13 0xb6ccddd6 in KIO::Connection::qt_metacall (this=0x8db8ee8, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x9f2d688) at /usr/src/debug/kdelibs-4.2.90/build/kio/connection.moc:73
#14 0xb6a94a1b in QMetaCallEvent::placeMetaCall(QObject*) () from /usr/lib/libQtCore.so.4
#15 0xb6a964b0 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#16 0xb5f3069c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#17 0xb5f3899e in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#18 0xb7e89b9d in KApplication::notify (this=0xbfbc8938, receiver=0x8db8ee8, event=0x89c2b18) at /usr/src/debug/kdelibs-4.2.90/kdeui/kernel/kapplication.cpp:302
#19 0xb6a85adb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#20 0xb6a86725 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#21 0xb6a8691d in QCoreApplication::sendPostedEvents(QObject*, int) () from /usr/lib/libQtCore.so.4
#22 0xb6ab190f in ?? () from /usr/lib/libQtCore.so.4
#23 0xb421d9c8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#24 0xb4221083 in ?? () from /usr/lib/libglib-2.0.so.0
#25 0xb4221241 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#26 0xb6ab1558 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#27 0xb5fd0975 in ?? () from /usr/lib/libQtGui.so.4
#28 0xb6a840fa in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#29 0xb6a8453a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#30 0xb6a869e9 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#31 0xb5f30517 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#32 0x0804a800 in _start ()

Reported using DrKonqi